Review: Karma Sells Unlimited Mobile Broadband — But Is That a Viable Business?
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(Photo by Rob Pegoraro/Yahoo Tech)

Unlimited data on a WiFi hotspot has become the unicorn of wireless broadband — much sought-after, but rarely realized. But one company wants to change that.

In November, the Sprint reseller Karma Mobility introduced a surprising addition to its prepaid service: a $50 unlimited-data Neverstop plan that lets you download and upload at will over a Karma Go LTE hotspot (normally $149, on sale for $129 to new Neverstop customers).

The limits of “unlimited”

It’s been done before: In 2010, the long-gone Clearwire’s unlimited-data service impressed me. But more recently, the only way to get unlimited mobile data has been to confine it to a phone: Sprint and T-Mobile’s unlimited plans cap how much you can share via tethering.

New York-based Karma does, however, impose two lesser obstacles that set Neverstop apart from its older “Refuel” option (whereby you pay $9.90 to $14 per gigabyte of data): Downloads and uploads have a 5 Mbps speed limit, and you can only tether three devices at once.

(Karma’s WiFi setup requires a Web login, not a standard password sign-in, so browser-less gadgets like a Chromecast can’t be among those three.)

Sprint’s LTE is not the best — it was particularly slow during a November visit to Karma’s offices — but it can easily beat 5 Mbps. On the Go I’ve been testing, I’ve seen it top 15 Mbps several times in Washington, New York, and in between.

Then again, it wasn’t that long ago that 5 Mbps was unimaginably fast compared to most mobile broadband. So I had to try.

Fast enough

The verdict after a week of using Neverstop with a MacBook Air and an iPad mini 4: While 5 Mbps suffices for browsing, e-mail and updating an iPad’s apps, it leaves little cushion for streaming video.

I was able to watch a surprising amount of interruption-free HD on Amazon and Netflix. But hiccups with the Sprint connection or the Karma’s WiFi would drop the resolution to standard definition. At worst, I was left with blurry footage that reminded me of watching RealVideo over dialup in the 1990s.

Karma isn’t brushing aside such caveats. As CEO Steven Van Wel wrote when introducing the service: “It’s not practical for most people to use Neverstop as their only Internet connection, but if you’re a light user and looking to cut down on costs, you’re welcome to give it a try.”

It seems that Karma’s customers are. Since Neverstop’s debut November 5, it’s accounted for 70 percent of sales.

Is it viable?

That brings up a larger question: Can Karma — which must pay Sprint for every bit of the bandwidth its customers consume — afford to keep selling unlimited data?